docs: def get_morph_files(directory):
      '''Get a list of all morphology files in a directory
  
      Returns:
          list with all files with extensions '.swc' , 'h5' or '.asc' (case insensitive)
      '''
      lsdir = (os.path.join(directory, m) for m in os.listdir(directory))
      return list(filter(_is_morphology_file, lsdir))